Transient killer whales were renamed Bigg’s a couple of years ago in honour of Dr. Michael Bigg who’s research changed the way we look at these animals Bigg’s Killer Whales are significant less picky than their resident cousins when it comes to prey. Biggs hunt marine mammals. Everything from small seals to whales twice their size! Bigg’s Killer Whales are frequently found in much smaller groups than residents and their family bonds do not appear to be quite as strong. Possibly due to the stealth they require to take down their prey, Bigg’s are usually found in groups of 3-5 animals.